There is no evidence supporting a specific date and place of birth for Margery. Also, there’s bona fide evidence to keep John Lovett and Margery Lovett attached as her parents.
Wikitree states and supports the following:
“This profile originally stated that Margery Balch, the wife of John Balch, died at Beverly, Massachusetts January 31, 1682 and that John and Margery were married 12 September 1625 in St Cuthbert at Wells, Somerset, England. No evidence has been found to support either statement. Galusha Balch stated "There is no record of her parentage or the date of their marriage, but it is not improbable that theirs may have been the first and perhaps only marriage in the Naumkeag settlement."[1]
“Robert Charles Anderson says there is nothing to support the various parishes in Somersetshire that have been suggested as Margery's husband’s origin. Anderson does not name a father for John Balch or a surname for Margery. Anderson says that Margery was in the list of Salem church members in December 1636[2], so her date of death has been changed, only indicating that it was after December 1636.
“No evidence has been found supporting a maiden name of Lovett for Margery, so it has been changed to Unknown.”
https://www.wikitree.com/wiki/Unknown-354751
